Increasing the number of confirmed gravitational lenses also enables an exciting range of discovery space such as compound lenses for measuring the Hubble constant and time-variable phenomena for repeated observations via time delays [1]}, [2]}, [3]}. The arcs provide multiple sightlines to probe tomographically the circum-galactic medium (CGM) of the intervening galaxies [4]}, [5]}, including the foreground deflectors. The \(\sim 100\)  parsec-scale measurements that are possible with diffraction-limited observations of lensed sources are particularly relevant for the current and next generation of Adaptive Optics intruments [6]} as well as with the James Webb Space Telescope for extending galaxy scaling relations to even lower masses at \(z_{\rm src}\)\(\ge 2\) .
